CN107577883A - A kind of determination method of preferable spacing between hole is filled in multistage hole plug - Google Patents
A kind of determination method of preferable spacing between hole is filled in multistage hole plug Download PDFInfo
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- CN107577883A CN107577883A CN201710819971.2A CN201710819971A CN107577883A CN 107577883 A CN107577883 A CN 107577883A CN 201710819971 A CN201710819971 A CN 201710819971A CN 107577883 A CN107577883 A CN 107577883A
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Abstract
The present invention calculates the energy-loss factor that every grade of hole is filled in multistage hole plug by combining numerical value simulation algorithm, and by compared with energy-loss factor of the energy-loss factor for simulating the every grade of hole plug being calculated when this every grade hole plug is filled in separately as single-stage hole, if both are different, then correct the spacing between the plug of hole, increase the spacing between current hole plug and its upper level hole plug, then simulation calculates the energy-loss factor for deserving prime hole plug again, and it is compared again, until when the energy-loss factor when energy-loss factor for the hole plug that simulation is calculated is filled in it as single-stage hole is identical, determine that spacing of the hole plug currently between the plug of its upper level hole is preferable spacing.
Description
Technical field
The present invention relates to the determination side of preferable spacing between hole plug in hole plug spacing field, more particularly to a kind of multistage hole plug
Method.
Background technology
It is more prominent the characteristics of couloirs, high water head, big flow, high concentration of sediment with the development of high dam construction.With Xi Luodu
Reach the first in the world for the flood discharge energy of representative, flood-discharge energy-dissipating turns into one of high dam construction most critical technical problem.Suit measures to local conditions
By reconstruction of diversion tunnel into permanent flood discharging tunnel, and multistage hole plug or orifice plate are installed in flood discharging tunnel and carry out reasonable energy dissipating, have it is economical,
The characteristics of arranging simple and energy dissipating efficiency high.But for there is the higher hydroelectric project of energy dissipating requirement, single-stage hole plug can not
Meet engineering specification, therefore, it is necessary to row energy dissipating is filled in using multistage hole.
The fluidised form of hole plug is as shown in figure 1, in the plug flood discharging tunnel of hole, and current are by sudden contraction sudden expansion come the energy that dissipates, i.e. current
It could recover normal by a segment distance at hole plug rear portion.At present, research shows, the current at single-stage hole plug rear portion about undergo 3D
The distance of (D is flood discharge hole dia), flow-shape return to normal.However, in filling in flood discharging tunnel in multistage hole, the superior and the subordinate's hole plug
Between can produce and influence each other, therefore, for the plug of multistage hole, 3D is not the preferable spacing between the plug of hole in multistage hole plug.
To sum up, a kind of method that can determine the preferable spacing in multistage hole plug between the plug of hole is needed badly at present.
The content of the invention
The technical problems to be solved by the invention are, there is provided a kind of determination of the preferable spacing in multistage hole plug between the plug of hole
Method, it can determine the ideal distance located in multistage hole plug between the plug of hole.
In order to solve the above-mentioned technical problem, the invention provides the determination side of preferable spacing between hole plug in a kind of multistage hole plug
Method, it includes step：
The aperture ratio of every grade of hole plug in multistage hole match is obtained, and the aperture ratio filled according to every grade of hole calculates every grade of hole plug conduct
Energy-loss factor when single-stage hole is filled in；
The energy-loss factor that every grade of hole is filled in the multistage hole plug is calculated with reference to numerical simulation trial and error procedure；
Judge to work as the plug conduct of prime hole described in whether simulate the energy-loss factor filled in when prime hole being calculated is equal to
Energy-loss factor when single-stage hole is filled in；
If equal, using described when spacing current between the match of prime hole and the match of its upper level hole works as prime hole as described in
Spacing between plug and its upper level hole plug is preferable spacing；
If the increase spacing worked as between prime hole plug and its upper level hole plug, and simulation calculates increasing again
Add described when the energy-loss factor of prime hole plug after spacing, then judge to recalculate to obtain again described works as prime hole
Whether the energy-loss factor of plug is equal to the energy-loss factor when prime hole plug is filled in as single-stage hole, if,
Increase spacing again and recalculate until the energy-loss factor being calculated is equal to the prime hole plug of working as and is used as single-stage hole
During energy-loss factor during plug, using corresponding spacing as between the ideal when between prime hole plug is filled in its upper level hole
Away from.
Wherein, the aperture ratio of every grade of hole plug is identical in the multistage hole plug.
Wherein, the multistage hole plug is filled in for two level hole, and when the aperture ratio is when between 0.4~0.8, the superior and the subordinate hole is filled in
Between preferable spacing be 5.4~5.7D.
Implement the embodiment of the present invention, have the advantages that：
The present invention calculates the energy-loss factor that every grade of hole is filled in the plug of multistage hole by combining numerical value simulation algorithm, and by mould
Energy loss system when the energy-loss factor for the every grade of hole plug for intending being calculated is filled in this every grade hole plug separately as single-stage hole
Number is compared, if both are different, the spacing between the plug of amendment hole, that is, is increased between current hole plug and its upper level hole plug
Spacing, then simulation calculates the energy-loss factor for deserving prime hole plug again, and is compared again, until simulation calculates
When energy-loss factor when the energy-loss factor of the hole plug arrived is filled in it as single-stage hole is identical, that is, determine that hole plug is worked as
Spacing between the preceding plug with its upper level hole is preferable spacing.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of single-stage hole plug flow state；
Fig. 2 is that an example structure of the determination method of the preferable spacing between the plug of hole during a kind of multistage hole of the present invention is filled in is shown
It is intended to；
Fig. 3 is that hole is filled in an embodiment of the determination method of the preferable spacing between the plug of hole during a kind of multistage hole of the present invention is filled in
Flood discharging tunnel reference axis schematic diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Referring to Fig. 2, an embodiment of the determination method of preferable spacing between hole plug in a kind of multistage hole plug of the present invention
Flow chart, specifically, the determination method of preferable spacing includes step between the plug of the hole in the present embodiment：
S201, the aperture ratio of every grade of hole plug in multistage hole match is obtained, and every grade of hole plug conduct is calculated according to the aperture ratio
Energy-loss factor ξ when single-stage hole is filled in.In one embodiment, make the aperture ratio ξ of every grade of hole plug identical, and the aperture ratio
ξ calculation formula is：
ξ=0.36 × (d/D)-5.7(1),
Wherein, ξ is the energy-loss factor of hole plug, and d/D is aperture ratio (d is orifice plate diameter, and D is flood discharge hole dia).
S203, the energy-loss factor ξ that every grade of hole is filled in the multistage hole plug is calculated according to numerical simulation trial and error procedure1。
It is calculated in S205, judgment step S203 as the energy-loss factor ξ of prime hole plug1Whether step S201 is equal to
In the energy-loss factor ξ that is calculated, if equal, perform step S207, no person, perform step S209.
S207, will deserve prime hole plug and its upper level hole match between current spacing as deserving prime hole plug and thereon
Preferable spacing between the plug of one-level hole.
S209, the spacing between prime hole plug and its upper level hole plug is deserved in increase, and performs step S203.
In the present embodiment, the energy when the energy-loss factor for judging that simulation calculates is filled in hole plug as single-stage hole
During loss coefficient difference, then need to recombine the energy damage for deserving prime hole plug after numerical simulation algorithm calculating increase spacing
Coefficient is lost, whether the energy-loss factor for deserving prime hole plug for then judging to recalculate to obtain again, which is equal to, is deserved prime hole
Energy-loss factor of plug when fill in as single-stage hole, if increase spacing and recalculating again up to being calculated
When energy-loss factor is equal to energy-loss factor when prime hole plug is filled in as single-stage hole is deserved, corresponding spacing is regard as this
When the spacing between prime hole plug and its upper level hole plug is as preferable spacing.
With reference in specific embodiment in the present invention combine numerical value simulation algorithm calculate energy-loss factor, and according to
Compared with energy-loss factor when simulating the energy-loss factor calculated and hole plug being filled in as single-stage hole, until eventually finding
The step of preferable spacing.
Specifically, because hole plug or flood-releasing tunnel are generally horizontal positioned, shadow of the gravity to their hydraulic characteristics
Ring less, therefore, gravity, which can be neglected, to be influenceed, then builds the coordinate system of the hole plug Flow Numerical Simulation shown in Fig. 3, and due to hole plug
Flood discharging tunnel is horizontal positioned and has strict Three-dimensional Axisymmetric, i.e., hole plug any axis of flood discharging tunnel plane flow characteristics all
It is identical, therefore, in one embodiment, the Three-dimensional simulation that hole is filled in is reduced to axial plane Two-dimensional numerical simulation, specifically,
The flow characteristics of the whole hole plug each plane of flood discharging tunnel is represented with the flow characteristics of XZ axial plane two dimension flood discharging tunnel planes.
In one embodiment, the numerical simulation algorithm is carried out with FLUENT, and the model for calculating use is RNG
K- ε models, then the governing equation group of the RNG k- ε models is as follows：
(1) mass-conservation equation (continuity equation)：
(2) momentum conservation equation：
(3) k- equations：
(4) ε-equation：
Wherein, xi(=x, y) represent the coordinate in axially and radially direction；ui(=ux, uy) represent axially and radially direction
Flow rate of water flow；ρ represents the density of current；P represents pressure；V represents the dynamic viscosity of current；vtRepresent vortex viscosity, vt=Cμ(k2/
ε), k represents turbulent fluctuation energy, and ε represents disorderly kinetic energy dissipation rate, Cμ=0.085.
The value of other specification is as follows：η=Sk/ ε, C1=1.42,ηo
=4.377, λ=0.012,C2=1.68, αk=αε=1.39.
The boundary condition of calculating becomes a mandarin border, Outlet boundary, symmetry axis border and wall border.Each boundary condition according to
Following methods processing：(1) boundary condition that becomes a mandarin becomes a mandarin, and mean flow rate, Turbulent Kinetic are distributed, dissipation turbulent kinetic energy is distributed.It
Mathematic(al) representation be respectively：uin=u0；K=0.0144u0 2；ε=k1.5/ (0.5R), wherein：u0It is averaged for flood discharging tunnel entrance
Flow velocity；R is flood discharging tunnel radius.(2) Outlet boundary processing method is as follows：It is assumed that go out stream fully development.(3) symmetry axis BORDER PROCESSING
Method is：It is assumed that radial velocity is 0, and the gradient of each variable radially is 0.(4) wall boundary processing method is：Boundary layer
Used in stream without sliding it is assumed that is to say, the speed on wall border is all equal with boundary node velocity component.
Due to being more than 10 when Reynolds number5When, Reynolds number goes length and energy-loss factor almost without any shadow backflow
Ring, therefore, in one embodiment, row simulation is filled in two-stage hole and is calculated, and select a diameter of 0.21m flood discharging tunnel, its
Calculating flow velocity be 1m/s (and calculate when Reynolds number be all higher than 105), then its result of calculation is as shown in following table one：
From upper table one, when aperture ratio d/D is in the range of 0.4~0.8, when the superior and the subordinate, hole plug spacing reaches more than 5.7D
When, hole plugs at different levels can preferably play respective dissipating functions, and in Practical Project, the spacing between the superior and the subordinate's hole plug is arranged in
5.7D or so is rational, and the preferable spacing between current hole plug and its upper level hole plug is 5.7D.
Above disclosure is only preferred embodiment of present invention, can not limit the right model of the present invention with this certainly
Enclose, one of ordinary skill in the art will appreciate that all or part of flow of above-described embodiment is realized, and will according to right of the present invention
Made equivalent variations are sought, still falls within and invents covered scope.
Claims (4)
1. a kind of determination method of preferable spacing between hole is filled in multistage hole plug, it is characterised in that including step：
When obtaining the aperture ratio of every grade of hole plug in multistage hole match, and every grade of hole plug calculated as single-stage hole plug according to the aperture ratio
Energy-loss factor；
The energy-loss factor filled in every grade of hole is calculated according to numerical simulation algorithm；
Judge work as prime according to being equal to whether the energy-loss factor filled in when prime hole that numerical simulation algorithm is calculated
Energy-loss factor when hole plug is filled in as single-stage hole；
If equal, using the current spacing between the match of prime hole is matched its upper level hole be used as it is described when prime hole plug and
Spacing between the plug of its upper level hole is preferable spacing；
If the increase spacing when between prime hole plug and its upper level hole plug, and the simulation of binding number value is calculated again
Method calculates described when the energy-loss factor of prime hole plug after increase spacing, then judges to recalculate to obtain again described
Energy-loss factor when the energy-loss factor of prime hole plug whether as single-stage hole fill in when prime hole equal to described in by plug, if
, then increase spacing again and recalculate until the energy-loss factor being calculated works as the plug conduct of prime hole equal to described
During energy-loss factor when single-stage hole is filled in, corresponding spacing is used as described between prime hole plug is filled in its upper level hole
Spacing is as preferable spacing.
The determination method of preferable spacing between 2. hole is filled in multistage hole plug as claimed in claim 1, it is characterised in that the multistage
The aperture ratio of every grade of hole plug is identical in the plug of hole.
The determination method of preferable spacing between 3. hole is filled in multistage hole plug as claimed in claim 1 or 2, it is characterised in that described
Numerical simulation algorithm uses axial plane Two-dimensional numerical simulation algorithm.
The determination method of preferable spacing between 4. hole is filled in multistage hole plug as claimed in claim 3, it is characterised in that the multistage
Hole plug is filled in for two level hole, and when the aperture ratio is when between 0.4~0.8, the preferable spacing between the superior and the subordinate's hole plug for 5.4~
5.7D。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710819971.2A CN107577883A (en) | 2017-09-12 | 2017-09-12 | A kind of determination method of preferable spacing between hole is filled in multistage hole plug |
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| CN201710819971.2A CN107577883A (en) | 2017-09-12 | 2017-09-12 | A kind of determination method of preferable spacing between hole is filled in multistage hole plug |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215932A (en) * | 2013-03-19 | 2013-07-24 | 浙江海洋学院 | Flood discharging tunnel pore plate building method |
| CN104991992A (en) * | 2015-06-01 | 2015-10-21 | 浙江海洋学院 | Calculation method of hole plate water-flow pressure recovery length |
| CN105045987A (en) * | 2015-07-06 | 2015-11-11 | 浙江海洋学院 | Method for calculating relation of influence of thickness of pore plate on energy loss coefficient of pore plate |
-
2017
- 2017-09-12 CN CN201710819971.2A patent/CN107577883A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103215932A (en) * | 2013-03-19 | 2013-07-24 | 浙江海洋学院 | Flood discharging tunnel pore plate building method |
| CN104991992A (en) * | 2015-06-01 | 2015-10-21 | 浙江海洋学院 | Calculation method of hole plate water-flow pressure recovery length |
| CN105045987A (en) * | 2015-07-06 | 2015-11-11 | 浙江海洋学院 | Method for calculating relation of influence of thickness of pore plate on energy loss coefficient of pore plate |
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